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20 perfect places to survive the end of the world

Cheyenne Mountain Complex, Colorado

This facility opened in 1966 to house elements of the North American Aerospace Defense Command (NORAD). The main entrance is guarded by two 25-ton blast doors, and there are several tunnels and side chambers found inside, containing equipment and supplies, including water reservoirs and backup generators. Today it remains operational, and serves as a training centre. So probably not a great idea to turn up without an invite.